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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a28e937e5f518effbcb67f1aea1c2f00464a5b286edbf319fb3093fadfb0237' 
  AND token = 'UO8ifiKKb0pn6RShhNwQDka0h+HhUGi1eqxseBEYWYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}