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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '515caf1bd006cd4d0a61cc76d113ea76d4a73d91a62da96c4814c97fd43a54ba' 
  AND token = 'ictvSft2rY5iabyL4A/t3fdiuEW5z0IlWSjhgkqR+U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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