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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a7367047dbe0f5508b2e085bd1833a7cdf2ac25ea4f41ffa56a3f3e9ea1a3e78' 
  AND token = '8Pjyr4yZvZsVWH8+BOVhXCFTYZr9B4J8xf15NPiRc5s=' 
  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"
    }
  }
}