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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce68fa219e0916984754b4ac443a3b68e08451ecf0715e18499d7385a0634fa7' 
  AND token = 'AK/0yLWkZUTnJjE47N5MDQ2R3iDkbVRKEblxenylTWc=' 
  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"
    }
  }
}