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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3341084ded21908981807a803d00f8df559f0aa1eac910b764cc642a0497a41e' 
  AND token = 'En+AfXnbFOVqjJvs40grsCAO6jQ/2Vq2NXzgOfWvMP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}