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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110daacfa8b2932ec0aa9e7386903a4cb1e92e1276a1d6b83f2d8a4333309e8a' 
  AND token = 'Z+rRMm0sgEAv12pJ+f9H/5SbwZNrU6SUxjUAtqKNRjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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