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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0f224722c4e5f0fa883547d56cdcd85e2a54502e6478e1ff6f8713ece4c1bd' 
  AND token = 'duWPJn/1V2rFzA2vYmohBk6wH6HYC7wE9elT2Zn4Clo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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