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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b816b5063a69b70533d2204a38831194083036e491507c64afd4a2cde093cb02' 
  AND token = 'LYw6MX8OEuvZEs6GIzcDSP+qZIyKlD3rt2rdlsEX4gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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