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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a522dadd8cb3812d30c19a3d503ebe143d64662d952514716091afe45f7611d8' 
  AND token = '/S1eAdYcI0zuuUwULDEMx0cYn3tlXK+Ien3NKgipAL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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