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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5b30a8e20b163956d3e42e70ebc8c3902f31a13cc1d3b108bf9102e926c6d1' 
  AND token = 'QSVs/ylMWxYUnrHAaC4Mq45fNAZMPdWYKJSlZG5u2EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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