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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '536c6e93ce021bcc172c86d14f449cf639eaedc8efb2945b94cbae3b0294ee41' 
  AND token = 'yfxSCNsQLAehB2ax+g8JSeKmccSFN9yKcw3kG7Hn/8c=' 
  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"
    }
  }
}