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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c049025dc512fe6ba55ec4d5ddcb59f37bb95edecb4094a2a2a28f4e8a35de2' 
  AND token = 'Wq4A34fi8aueShz7w6sR7xetiq38YWRH5zgTlwNyc/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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