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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7c0187353f843a14d2d9b785fb3d55c16d75a4ad1dc639d7df9e376a3df2bc7e' 
  AND token = 'VR72gv4MErNqwjN7j20t+5PfJRDHoeNde3bFYq+x4zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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