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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '863a766683e53ff7c80fc97931c80fe7f92226bcc24e3336492e3da2c39b2308' 
  AND token = '/a8jIVJwNaJTWjWZ1GkCGVkdozgCCBiz6tmgjaUi3JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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