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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26119d38a64ac3f1d6ca768b33d1291866ed4a5a6506c168f6d156e0715b1f46' 
  AND token = 'V5eqNi152+KgW+UlwDKGOm20p36Q6kl8GGkhlAZmDEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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