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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d6f410b0c0c98a0f7a91483573215c86dc96d31f8f022d36fa716eb661dabc' 
  AND token = '8Glnxdyq83ao5II/OcUwizZ70FXQp+mPZnPFAzgRtBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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