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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '20619cbd0ab4a1e71a710da717058ffd58508581eee020cc93e2a3773f5aed6a' 
  AND token = 'O3q1CxuQVx+FoDjch6sBUpPKJcJjSbD5WU5c5KyU0zo=' 
  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"
    }
  }
}