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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8192c28643084ab9cf873327fca8a0244b398d8d585047e7f3fe3e49b2857cdc' 
  AND token = 'tGk6OHDhsjb1AzhtriYtr9hPmX2N8j+Rh7nNQSbvx30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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