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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf212fa11378f153a10562dfc3b2443427e3f9e73e693d95711a13113df8ab45' 
  AND token = 'kcR21cPYUf3XQS1pbgbFnCeVWYYHVBOv1rB6To9vJdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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