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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60fef25bcffc6e9a254a277f13d68d5a51445679186eefcc672789081614ece8' 
  AND token = '5CnZOfefZWlmhqfTQJILQclRkXu/V26q9RpDY7V0i0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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