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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c62ecc158a7b234472299553070de5bc78ec1ab0e3a9c197fc4657f36a7a61ac' 
  AND token = 'OFo7r1Bx9teiWGCyPyB0f6ayft+VD0jIg8bM8FS7trw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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