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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08203e57f4cff3b06c00845a3e6794116572bf398e106f0367286e6dd56591f4' 
  AND token = 'TSuo4EtxboRepEKpgNAhkM0bl96O7pOFCb0ku5GfOao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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