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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91aaec32b1ed86dccbb2cdfcdc1cc530e7c34d1870eb78b7f945af0b3fd4980e' 
  AND token = '2xob/YPX61Hzj9nX6mmRrOllOW7FAA4Rn0wBmI3Q78Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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