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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '768ca504bce3292f8051ea35c32ae960c3161aed6a9dda45684b49a69ca2be25' 
  AND token = 'qlop8t2EoejSp30MQGD/BPj2HjOiaGFdgOrD9yVblWQ=' 
  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"
    }
  }
}