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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86cdef8cc04940ca2489a41ce2596d0f02130ef012b33f82c7873ccb4eb02e0' 
  AND token = 'DTnS+m9wxf8yHNYMVfHFfybRrG5WZZWSl+kXf24Y/Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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