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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24a644adc7f102a052c1d2f268b391cbdc38e2b5dc0dbfe91ab95735ac2045c' 
  AND token = 'Y9LLwP9CKbHpf9pr0v8mGvYiuFOeAmt3EJFJq1A8oEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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