SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7c2a0b5a3e1f893f2878577bc7254844879f9b42914f6a6753945b10970ba46c' 
  AND token = 'S9h3sMvx3/kXrYUl/3azItJyGKc6GRbsqLnpqsYCY/U=' 
  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"
    }
  }
}