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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ab950ad2d1db38d29849aaaab312d74c6859a75856aa09f98868fe2e93f28d' 
  AND token = 'fEK7ygAE1Zbii30WTponaq5OSqUUIzdsTQ5gaDxa110=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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