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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea0b8d2bf510bf6fde73cf18f19d86699731ab0740572d202c804e857fc27dd' 
  AND token = 'HZlDcCKsbPopx90yWIIES2bWpH/8cOB4g3PQhOS45Eo=' 
  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"
    }
  }
}