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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d595d023dbf91f225b317154446746e414491f2c9c9ae0fb1baa8ce433ae9e' 
  AND token = '1ypLuKBJl6g5jUtuwQQNSnK+l6/UjAN2HPcKU2QJBn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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