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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e158f7502ed3d12a88e8c4dd8b5bc08d33b4cca13a1e5b1bdfaa64c12f1ae1ce' 
  AND token = '/5aI5hy+SL5zRyz84/u0NG9XRLzoCOiCGYhyt5vsrsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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