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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4b331ee2de0adb07623af6893c48e9f2b1a16b31ddb6b62e0d979bc70b4d8e' 
  AND token = '5S+JmZqU4H7zvCF7Lf7AnuBB0eT9WfC14EPBcpyllwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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