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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b960373567f0191c9b6bf0094a5270b5ca376898f0ba8ba1e63b16c50463647d' 
  AND token = 'Ahr0PFSqffQ80/hzIdqG8P4wQ7jfCZ1fglRga9/ha64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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