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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7739cf9c0c9317524562ad004fdfc9274028f3bbb9651261982661f0ce7bad' 
  AND token = 'vR1whOOn/UQhatI4cWjlv6wn+R0pZGaX5x72oi3QcKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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