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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15dbdb9042c6cb9a99ddaceb0a427e61453a4c21af5fcd406e66bd88a6ed518' 
  AND token = 'T2WjHRCtC2OgrYqWFBFD4i5DgcWKk05ZXAvp3qiXadU=' 
  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"
    }
  }
}