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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7dd17c6e30e483bb7e30b6253f9468ea3e9bfd24981498b3f7f024285af6f3bf' 
  AND token = 'Mr99ljk0OpZ/hk75qJvdbjHR07NpprQ6s1R09G25uK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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