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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45a300f434d0bc8630d96433f922020bc783775df7a5fadf58910f3bccb2b4e' 
  AND token = 'fU4hI0Qp55IaKThK2oLEMrxpJTG48b37DGSG+LLrkh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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