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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce33c3c342470dec6009a533c23aff185dbc8518975696a7c10b82f27be4566' 
  AND token = 'K0lq/+TskEry89nkSFK4g5P2NpnDx7x+nQmIzkbA3Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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