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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f2051303e077ebe94100d902810da8840c944ceedb10aaa385a1311cc345bf' 
  AND token = 'CzhlEunDeLv9xWh+s8VabX4ZX7t+HTsosg9vXu/G2wQ=' 
  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"
    }
  }
}