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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5a812ca6b061e69ccafa5ad8e0eed6d25cf3d213f1d267bfd9f758fd69438a' 
  AND token = 'AidAqUEeEKP+Llb9NbOah4q0ocuUCZSJYfMiymJD4tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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