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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '437fd666bf4187c93807e40f9002183a14545d587c0def3d9d39a0e115e6dd5b' 
  AND token = 'Z+p2RdBjov2XefDZan+QeAJ0KS4IXwpOUrPIBLMd5pc=' 
  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"
    }
  }
}