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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb2af4c2be6bf8a4a11ba504e880ca3a0895619a08aa189b14f5f3f8a2ed6d3' 
  AND token = '9Hbt/4Cv7PUHMl3HoDaNVm9cPzxegeo4VYn7BKUcJFA=' 
  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"
    }
  }
}