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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2f0e19361d0a57b726fc34fb866150ec80d056165dc37c55ffeef931b7cda5' 
  AND token = 'Df8ttweT8pezVgn3YFbczrEPMvTyrZ48/LSZ7+/RV6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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