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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c82757f73ee5e288e823eb9e0bfab11d467013e696f5d04e3ba29326b706f09c' 
  AND token = 'eZpwr/8AhtMygOgYPTrl1pkMVuLeSNSMXR6Y7DGSuWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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