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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50a375e67e9f31bc726c9ddf8a2a9133fc069b12a27c9fcde30b6ba481de4310' 
  AND token = 'atqfYIQ1m8PGgvabaOUz8Xulz0M7RsuPxe2TEdTdLoc=' 
  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"
    }
  }
}