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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b94d76f209279f7f47ec1a4e3115e3d457a612d7ca859965289a4c0fbca4ad6' 
  AND token = '2ql39DH9NUD/oNwio+szyNCeVobO+VFziJT1o1ze4LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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