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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3d50b71b2ea331935318551f776b91dda7a29c3432d5df3d664982842f2ce0d4' 
  AND token = 'uKktPNAT/DMDFwcKETxFqTWwNGn6TNTh8Pk5Bj1fcPQ=' 
  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"
    }
  }
}