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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73832681cd5d903a69774817ce930743f2d1a3cdef54d9e50cbb3d2daddb3ba4' 
  AND token = 'sY4/oy+4EhXZnP8C6lMTmF+Kqe3ryOdoSH+xxAES314=' 
  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"
    }
  }
}