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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c3fad1c7ca84e41a2c074a88ae71be5c0281fe720212dd88fb33f4990ed43008' 
  AND token = 'YHOsklG+dZ5k1+hM8IczSeRyG/FP8FtpFvjk1XjSfNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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