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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4ac2992cca86cff569a4d01d238a136dfd5f7469f5ee808b59c7a1454fed43' 
  AND token = 'V9+96NGd0Fjf+gQk9KUdi1Y/9MZRFuW53y/s7dSlNuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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