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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '91febcbf52f49df36d0521396441593fd079ecfed3c9c5104dbbfa39f5d1b481' 
  AND token = 't0TH5mMTH9kClxQDYK2caFD6UcJN13i4bmNqUzPsBRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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