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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0a59bc5674ded2e6be94ddc795b86135e43a0c4aa223f7db7266dd9bf7a06a' 
  AND token = 'ZVM5yilxpBFktFuuM/Kn3gWjFm0aRWXR1mNjLEPJfoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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