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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '893c109281a7bb403a6e9d29f2d58352cd1d83faf3a81695ba20b0e4a6402105' 
  AND token = '2y3Fp2bmXcnFj9FTQUlCPLKl6a5VhS58qalbsNyPVcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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