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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f6b4e98e34133c8fbd30f67d4bbd036bc4838f91642dc1e518325d0ab7d56d' 
  AND token = 's5p6NfYzef+9S+nDq0j61GloqPd2B1APeVsVUa4W17s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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