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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b621bd924c620059e6cb504a9a2b6330e9a4a743959d566b48dfae9e5c711486' 
  AND token = '2Iu2E56BH1IucrxEP+9xaXHrq2jVUjFicrEEmoC6DMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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