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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919e6f9a1443bee98b5a3ef1025a1f11f9e5f1b4b780bc8bdab26b41991bf725' 
  AND token = 'VJ36D00Jm5O/bbI3831DaFP67FiTPuQVs73GbxHtEO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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