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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e3cb8350464112d2fdd7cbda699728e7efd4b54f48097c5b28cbbe48b88e64' 
  AND token = 'rNfM7Ghb54ORMflTzL5b1l1vBuFnJWDT6oB2Zms9KNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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