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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6637b1e19366bd325c7c5f9b756e849117259bdee9277d39f78e956e9f864f5c' 
  AND token = 'P3wpEFqiwG3cmshLia4oo+TF4ToOWjOdQnTCccGn+N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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